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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bd3ec457264d3b3ea02647436bdb75d42844b84c72e813ae7cbd6f6da57b2d1b' 
  AND token = 'SVqPSBGhu8Sd5fgUNN+Te21mpYLKLL36gO+F/5ddOyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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