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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '58efd91d06deb0551806b0d3fbb547ea73479261f065304ed3d7b21824b381f6' 
  AND token = '5D40chPfmDGDyaLkJs1QSyEOEZUb2T0V8g2Ol9LL63c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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