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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '92895cc7e25f5874defbecac33309627bb10ca08738c513160bbe0b3098bc1de' 
  AND token = 'uAy4jHM7cJIj7Sx356eBFSaju3znRIfPpBACU1qMPMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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