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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '78ba949f6c156ee8edba3381448e21f4bebdce2ac312d27e9a3be0166f227a15' 
  AND token = 'lyMRHXkE/QQUCb/dEqAD/64mW3Cuc5+e81sVia+VG+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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