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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '1589c76652fa0668c17f5b3fa5488effb4baa96eea911cb3e276f9afade02f51' 
  AND token = 'p37KMBF5gAF29+Jqr6WgaCrkULEawai1jX804reUJNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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