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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3df70af9ab5a698b632ca7cb9cac443c03351f59d55135d57c797b6aa8dac983' 
  AND token = 'EQaXp+fu+XzfJ9ta84cQxqfoQ2OCA84vdVXfaGSt30o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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