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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8b6eba0f9627cd3064bcfe717661f12ea4c178226db00aebd423be4895c5ba31' 
  AND token = 'enVa4FmGSs6CNjWDfY6860yGGMSBR5woslBcw3SRZlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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