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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b58365c71fc237665b09dbdce37e6d5a3c2b4b778363d6742d54c0bacb5366f2' 
  AND token = 'k1SjyxdDe7nE3q11vHGIZQEAL11maI5238mHucpJZDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}