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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1cc8cb0d018ded73d4406e4402034ee1c95a3e937e99a7464dc183d28e3c1ea8' 
  AND token = 't96Z+bGV7HBOdV64Byr10SC4/ZfMtVmBsARHmF6mKVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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