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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '81366300c5e4e544393e48799bc8b1cf1dba855bd126b2d5217625f948a1429b' 
  AND token = 'FkR1ciFmjvfnFIOQmwfgckc3n3rYBNCgE5BUJ+iG1bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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