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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '862063c68c24a76699880b99b11275577c1379b662a790f9a5214432850c6d7c' 
  AND token = '8w+I1S3Le2Rnrg+n7qISScmoul1+6YoXgUxDR2iLXQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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