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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '82957135a7003cb67a0e9d9d7a60a08ea4ecec83dbd207791cbafc8c94e4926d' 
  AND token = 'ERfnnXvDZDJt1nG4U0oL0S90OigPh06H2AXL+X20s1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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