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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e96f736e22204ddf70adf8e94901174914b31120316bd5177b02ed751f21d9d2' 
  AND token = 'Pqhmduoo4zFfzQyH6UvLMjnGXY1SNnfsxxNvnohE56E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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