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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f79b09cfabb4e6e1abf33b53bfaf4fffd1e708b398e7a5eb8904703b9f26c38e' 
  AND token = 'Qu1xb3nRngp4X7JFqMQaDNgCksozvLorSGB/NgepspI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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