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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a335cd719202153175bd09de621fdabeef6885dc4d5d8406984c53faea251e01' 
  AND token = '230m/CZRwkS/80wOMSfjtIKar6Qhk6tIYmanAQwqMxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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