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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b66c5ca4b529b8656fef6a246a783629e58a11bae1f011ab904779619f06a754' 
  AND token = 'DGtbm64iEBo9kbKL2JxaWsCeW0YiZLDZ7jFh4t5H1jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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