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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'df7dfa7f8e23d0badcb799aacf907218cad5d4c656d180c61808c1db4ac91905' 
  AND token = 'BDPpYQTa3tdcDFA8eG060wCx1gaACoROqRRnY7CWT7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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