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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '89789af8f48ac5db889589f6777381d294a220655ac617284a93e8f61808bf75' 
  AND token = 'm93RVB00NdoQ+euQWhY+saTf1InVea9j+KuYQPM9IMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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