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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '265be3fb751aae238432f2c0ee675bb5aee92bf91925f1f3f33c76ec043b6858' 
  AND token = 'GetiyX+WlVHT7CP3tYfH+t4BR6pqFnfraaAyyOKETEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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