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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c878c0256101ecd38d6a1554cdfa598353f253931dc9312df96ac75fde0f88ad' 
  AND token = '40Mi1pEfcEz3w/YNLCkU4vKTyp8/+X/zrFb1wYMKaI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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