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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e452df1e194d9a69d5bb1981fcc17b3d072b46344e3c41a5d84cc6bf32aefa17' 
  AND token = 'wQVZs3k2WFvzVDTnLA42+OnNQuyQ+pFWrgJP2Cw1HTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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