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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a42799247bff2a1a40970ee7ed1786ce7bd55261289b692a627668e89ceb082a' 
  AND token = 'FNw2n79yjk0fHIu05Oe7HGSgQFsLrwx6z7qiQFc83pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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