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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7c5ba28deb2802658dd8c710542104e47df6c3178cc962af9428eeb895ef7b33' 
  AND token = '02ihOpPauOt3F/ws3yuT/Em2KhMhrIPc55JL07K4Gz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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