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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e44f1cfc15022b2fbf97f2c823604b2f267a11e86a1e9480bdb06b179945a6b7' 
  AND token = '2wnUX11yBvKgXY80Wdkpw/M2u0cEUKdRI0C0bS3gOOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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