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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a86fccf6615c8ed5379a9cac6622ffd2609f1fc9812a0b792c22122d2ce31a4d' 
  AND token = 'sHZSAc0xUvOlUupilMjhGHCvz3Hi9p0gqHd/9u9kWRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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