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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f4d64ad3b6b5b8cf77571e8a672b18ac30c1a922cf9143216b24ec16a5dd8c11' 
  AND token = 'SB2Gek/uR/wTa9ri7kz3VnynRnveKQvyet3ZQyEzRMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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