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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eae899b94cf01c7ead69a516b7302adfab6ce02fda148fb317fcf9ab9c7f1314' 
  AND token = 'Xh3TTE6ZYfngxfHkkQEgTStHSGnn7uxbJWQS2+x9tlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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