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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c99f81d14cc7d09a0cd1f6f09085b0f183d14344fbc87479081b68f5e5eea3c8' 
  AND token = 'YBqmIenyHt/IDPiVK1UG1ayiGATe0LHifrX6dMMYlOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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