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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70bea53bf200ac61f4212905cc1359e65c301ae867c4cc297e8ae2221b8a8ea5' 
  AND token = '4tSKofK4LrL/oDrbicC9KL4YLBklITbLQbGwChSjPN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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