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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0844b11b5ef6e5a0ab6a2be045d4c53aba4828ea1b036e633a1d65f15984128f' 
  AND token = 'f/jJZyOlF2IFeIPkFUKHdsKSag+ScE5/ak4SE3iGNZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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