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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12bb8b13a2b0e753e85262ef7572e3756a20a106904ea889601f14fcf921808f' 
  AND token = 'fLDdVVNJaZH/fNP8we5/BOLg7M92lVP6t4NjLHS+9Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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