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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9351f6c9b77def1514aa29b16344350eeb03a649b4a0c75b3ae83c13a76ed86d' 
  AND token = '9oufP4SK3kOvPOTwv9iKKVKa7Fs7F5qmjqMSqoHrh1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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