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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f8604272ce0c525436e2f3547f1b63437c7a47ed2e66d0dcfa0bc38db22cd7a4' 
  AND token = 'qxtYx79g0gM2B3a3WSyPXisvPGLFyqxlCh0fGysC6D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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