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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b1c9e554eb9252c5cc23867640f716e808059d3eeb35ed7f01b10ac234519215' 
  AND token = '0gmPma26b7cYnroBeshAIQufKb1o0sPvXGx59dZhrxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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