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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '22c9f5fe22737560ba3fb12327e15c776ffd80cc5e67514500f50b95cc330cee' 
  AND token = 'BA+c0hDRiLKWHLcvqTWX7UVZglqX2ZWe0OUrKMbNhGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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