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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eba910ae754816e06e06103cf70b6b4f46bde7c777a02840b57ff7c95c4e8b58' 
  AND token = '+aY5ShDKPYkTYLfWSxphPb/eGhpguc9QZylmWj/woPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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