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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4719f33ff92319c48ab5f9112a8b1d4a0ae9be66402021c7e88ccad0c3c89149' 
  AND token = 'h8YpGwN1Eqji4SY6SM6ciIzRpbsSVb1LzHCxvGMwSIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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