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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4f268adec14c0605f8dce9c0a3a6f10af9e0879647d390d907246929316f8141' 
  AND token = 'AMuDiFMhsQ7uiNacV3azNtsbokE/PxImvc2aotlXVmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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