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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '93bb929dc242a5960c8d559cac7efbf1d44f633cdffae9e13fd99e7545cdaf3b' 
  AND token = 'tug9SHSkRB2OhJJOb01bW1v5b9irj667lyBpFInzfdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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