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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '65139b9b01930a92dd55b03446d53e6be032cbd6da97105831415f0a4ed4570c' 
  AND token = 'zwv2HrZdFxl1kLY7rOsrunKnoWdeGyUBc1Sk+lFyjKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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