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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '51f02d2182e12eb2c1c5df743a8bf127d809d1b1db67f63fff85cb0220f51205' 
  AND token = 'TgvvSPw4fdT1KLD+mBOmhSVOFHrkSEhtTICkyqtFX10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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