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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8e908488a74582a3ea398839bdcb3f51fc913955ab0dd8a1d39a3e4fa7d14acd' 
  AND token = 'R/5s4dOZZAC11Utix5jP+0OaP1D8gJI0f0XX68DNWok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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