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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '07f01a0cf9dc814ddc13d0cfbe462f3f39c93e94fd5bbc0b9e7eb9c28f7b4905' 
  AND token = 'EmsBd3fTiIE47ymuuvkcrAfqsB0UQ4oBnkeExu/vMiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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