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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7d5cf3e3e278e389f9f1a946fdf0eba5e68702196decab4f0675635b2e2788fa' 
  AND token = 'YdeoqtaFhRFDnhe/4iEBVFORw7K6Co0ZtETK1j1yC1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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